s390/vfio_ccw: remove unused variable

Fix this set but not used warning:

drivers/s390/cio/vfio_ccw_drv.c: In function 'vfio_ccw_sch_io_todo':
drivers/s390/cio/vfio_ccw_drv.c:72:21: warning: variable 'sch' set but not used [-Wunused-but-set-variable]
  struct subchannel *sch;
                     ^
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/vfio_ccw_drv.c

@@ -69,12 +69,10 @@ int vfio_ccw_sch_quiesce(struct subchannel *sch)
 static void vfio_ccw_sch_io_todo(struct work_struct *work)
 {
 	struct vfio_ccw_private *private;
-	struct subchannel *sch;
 	struct irb *irb;
 
 	private = container_of(work, struct vfio_ccw_private, io_work);
 	irb = &private->irb;
-	sch = private->sch;
 
 	if (scsw_is_solicited(&irb->scsw)) {
 		cp_update_scsw(&private->cp, &irb->scsw);